AVS 47th International Symposium
    Processing at the Nanoscale/NANO 6 Tuesday Sessions
       Session NS+NANO6+SS+MC-TuA

Paper NS+NANO6+SS+MC-TuA9
Ion Beam Assisted Self-Organization of Periodic Nanowire-Arrays on CaF2 Substrates

Tuesday, October 3, 2000, 4:40 pm, Room 302

Session: Self-assembly and Self-organization
Presenter: M. Batzill, University of Newcastle, UK
Authors: M. Batzill, University of Newcastle, UK
F. Bardou, University of Newcastle, UK
K.J. Snowdon, University of Newcastle, UK
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The fabrication of well ordered nanowire arrays over large areas is a challenge with many potential applications. Here we report a novel glancing incidence ion beam assisted self-organisation approach to form periodic wire-arrays over large areas on a CaF2(111) substrate. Preferential erosion of fluorine by the ion beam creates a surface enriched in calcium. The calcium self-organises in elongated island structures of preferential width and separation. If the sample is irradiated along a fixed azimuth we observe formation of nanowires with ~10 nm periodicity and wire lengths of at least several micrometers oriented along the azimuthal direction of ion beam incidence. Electrical conductivity measurements reveal a three order of magnitude lower conductivity normal to the wires than along the wires.